Low permeability filter cake limits damage from high-pH drilling fluids

Zhijun Wu, Younguan Hu Southwest Petroleum Institute Nanchong, China Velocity Sensitivity Test [26116 bytes] Scanning electron microscope photograph (left-undamaged; right-damaged) shows the damage to the clay structure in the reservoir cores after invasion by high-pH drilling fluid filtrate (Fig. 1). Changing the particle size distribution in high-pH drilling fluids and perforating underbalanced helped protect sensitive reservoirs from formation damage. In several wells drilled in a carboniferous reservoir system in China, invasion of the high-pH filtrate from the drilling and workover fluids seriously damaged the formation. An in-depth reservoir study det...

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